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3.リチウムイオン電池のスパイスモデル
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3.リチウムイオン電池のスパイスモデル

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3.リチウムイオン電池のスパイスモデル …

3.リチウムイオン電池のスパイスモデル

ユーザーがデータシートのスペックから簡単にリチウムイオン電池のスパイスモデルが作れます。充放電特性に再現性があり、バッテリーのアプリケーションのシミュレーションに最適です。

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  • 1. Lithium Ion Battery Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  • 2. Contents
    • Benefit of the Model
    • Model Feature
    • Concept of the Model
    • Parameter Settings
    • Li-Ion Battery Specification (Example)
      • 5.1 Charge Time Characteristic
      • 5.2 Discharge Time Characteristic
      • 5.3 V bat vs. SOC Characteristic
    • Extend the number of Cell (Example)
      • 6.1 Charge Time Characteristic, NS=4
      • 6.2 Discharge Time Characteristic, NS=4
      • Simulation Index
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  • 3. 1. Benefit of the Model
    • The model enables circuit designer to predict and optimize battery runtime and circuit performance.
    • The model can be easily adjusted to your own battery specifications by editing a few parameters that are provided in the datasheet.
    • The model is optimized to reduce the convergence error and the simulation time
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  • 4.
    • This Li-Ion Battery Simplified SPICE Behavioral Model is for users who require the model of a Li-Ion Battery as a part of their system.
    • Battery Voltage(V bat ) vs. Battery Capacity Level (SOC) Characteristic, that can perform battery charge and discharge time at various current rate conditions, are accounted by the model.
    • As a simplified model, the effects of cycle number and temperature are neglected.
    2. Model Feature All Rights Reserved Copyright (C) Bee Technologies Corporation 2011
  • 5. 3. Concept of the Model
    • Li-Ion battery Simplified SPICE Behavioral Model
    • [Spec: C, NS]
    • Adjustable SOC [ 0-1(100%) ]
    • The model is characterized by parameters: C, which represent the battery capacity and SOC, which represent the battery initial capacity level.
    • Open-circuit voltage (V OC ) vs. SOC is included in the model as an analog behavioral model (ABM).
    • NS ( Number of Cells in series ) is used when the Li-ion cells are in series to increase battery voltage level.
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 + - Output Characteristics
  • 6. 4. Parameter Settings
      • C is the amp-hour battery capacity [Ah]
      • e.g. C = 0.3, 1.4, or 2.8 [Ah]
      • NS is the number of cells in series
      • e.g. NS=1 for 1 cell battery, NS=2 for 2 cells battery (battery voltage is double from 1 cell)
      • SOC is the initial state of charge in percent
      • e.g. SOC=0 for a empty battery (0%), SOC=1 for a full charged battery (100%)
      • TSCALE turns TSCALE seconds into a second
      • e.g. TSCALE=60 turns 60s or 1min into a second, TSCALE=3600 turns 3600s or 1h into a second,
    • From the Li-Ion Battery specification, the model is characterized by setting parameters C, NS, SOC and TSCALE.
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Model Parameters: (Default values)
  • 7. 5. Li-Ion Battery Specification (Example)
    • The battery information refer to a battery part number LIR18500 of EEMB BATTERY.
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Battery capacity is input as a model parameter Nominal Voltage 3.7V Nominal Capacity Typical 1400mAh (0.2C discharge) Charging Voltage 4.20V ± 0.05V Charging Std. Current 700mA Max Current Charge 1400mA Discharge 2800mA Discharge cut-off voltage 2.75V
  • 8. 5.1 Charge Time Characteristic
            • Charging Voltage: 4.20V ± 0.05V
            • Charging Current: 700mA (0.5 Charge)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Current=700mA Voltage=4.20V Capacity=100% (minute) Measurement Simulation SOC=0 means battery start from 0% of capacity (empty)
  • 9. 5.1 Charge Time Characteristic  Simulation Circuit and Setting
    • *Analysis directives:
    • .TRAN 0 200 0 0.5
    • .PROBE V(*) I(*) W(*) D(*) NOISE(*)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1 minute in seconds Over-Voltage Protector: (Charging Voltage*1) - V F of D1 Input Voltage
  • 10. 5.2 Discharge Time Characteristic
    • *Analysis directives:
    • .TRAN 0 300 0 0.5
    • .STEP PARAM rate LIST 0.2,0.5,1
    • .PROBE V(*) I(*) W(*) D(*) NOISE(*)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 0.2C 0.5C 1C (minute) TSCALE turns 1 minute in seconds, battery starts from 100% of capacity (fully charged)
    • Battery voltage vs. time are simulated at 0.2C, 0.5C, and 1C discharge rates.
  • 11. 5.3 V bat vs. SOC Characteristic
            • Nominal Voltage: 3.7V
            • Capacity: 1400mAh (0.2C discharge)
            • Discharge cut-off voltage: 2.75V
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 0.5C 0.2C 1C Measurement Simulation Simulation
  • 12. 5.3 V bat vs. SOC Characteristic  Simulation Circuit and Setting
    • *Analysis directives:
    • .TRAN 0 296.82 0 0.5
    • .PROBE V(*) I(*) W(*) D(*) NOISE(*)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1 minute in seconds
  • 13. 6. Extend the number of Cell (Example)
    • The battery information refer to a battery part number PBT-BAT-0001 of BAYSUN Co., Ltd.
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 The number of cells in series is input as a model parameter Basic Specification Li-ion needs 4 cells to reach this voltage level
      • Output Voltage
      • DC 12.8 ~16.4 V
      • Capacity of Approximately
      • 4400mAh
      • Input Voltage
      • DC 20.5V
      • Charging Time
      • About 5 hours
  • 14. 6.1 Charge Time Characteristic, NS=4
            • Input Voltage: 20.5V
            • Charging Voltage: 16.8V
            • Charging Current: 880mA (0.2 Charge)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Current=880mA Voltage=16.8V Capacity=100% (hour) The battery needs 5 hours to be fully charged
  • 15. 6.1 Charge Time Characteristic, NS=4  Simulation Circuit and Setting
    • *Analysis directives:
    • .TRAN 0 10 0 0.05
    • .PROBE V(*) I(*) W(*) D(*) NOISE(*)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1 Hour in seconds Input Voltage Over-Voltage Protector: (Charging Voltage*4) - V F of D1
  • 16. 6.2 Discharge Time Characteristic, NS=4
            • Charging Voltage: 16.8V
            • Charging Current: 880mA (0.2 Charge)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 (hour) 0.5C 1C 16.4V 12.8V Output voltage range
  • 17. 6.2 Discharge Time Characteristic, NS=4  Simulation Circuit and Setting
    • *Analysis directives:
    • .TRAN 0 3 0 0.05
    • .STEP PARAM rate LIST 0.5,1
    • .PROBE V(*) I(*) W(*) D(*) NOISE(*)
    All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1 Hour in seconds Parametric sweep “rate”
  • 18. Simulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 Simulations Folder name
    • Charge Time Characteristic.................................
    • Discharge Time Characteristic.............................
    • V bat vs. SOC Characteristic..................................
    • Charge Time Characteristic, NS=4.......................
    • Discharge Time Characteristic, NS=4...................
    Charge_Time Discharge_Time Discharge_SOC Charge_Time(NS) Discharge_Time(NS)

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